International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 06 | Jun 2022
www.irjet.net
e-ISSN: 2395-0056 p-ISSN: 2395-0072
Design and Control of Grid Connected Hybrid Energy sources based BEMS Manikantha P S1, Dr.Eranna2 1PG
Student, Department of EEE, Dr.AIT, Bengaluru, Karnataka, India Professor, Department of EEE, Dr.AIT, Bengaluru, Karnataka, India ---------------------------------------------------------------------***---------------------------------------------------------------------two stage grid interfaced PV and BESS (Battery Energy Abstract—In this, a synchronized control of grid connected 2Associate
Management System) with ANFIS for voltage control [6] is proposed. Two-stage PV and battery energy storage system which operates by usage time for cost [7] is proposed for residential usage. The above mentioned systems suffers with lesser efficiency and higher cost, hence, for efficient grid-interfaced system it is not applicable. But, the single-stage methods provides higher efficiency compared to two stage toplogies. Various single stage methods are proposed, and a comparison between them are made [8], [9]. A grid interfaced single stage PV unit with better performance is analyzed [10], [11]. However, the compensation of neutral current is not provided, which leads to the higher harmonic contents in grid current.
SPV-DG-BES system is proposed with energy management control. The synchronized control regulates the DC-DC converter according to the availability of energy sources and grid system so that the injection of real power is done in order to charge the battery with reduced cost.
Key words—Photovoltaic source, dc-dc converters, Diesel generator system, battery charging.
I. INTRODUCTION Traditional energy sources such as fossil fuels are going scarce compared to the growing demands and also it leads to more pollution. The renewable energy sources such as PV is adapted due to low operating cost and as the power generation process is free of any pollution. But it is less efficient and non reliable due to frequent changes in weather conditions. To make it more efficient MPPT techniques such as Perturb and Observe (P&O), Incremental conductance algorithms are developed for single PV panel systems. These algorithms track the maximum PV power and corresponding voltage, so that it makes the converter operates on that particular voltage and extracts the maximum power. SPV (Solar Photovoltaic) energy is the mostly useable renewable energy source in the distributed generation (DG) units. The quick development of the SPV methods and usage of SPVs in the grid-interfaced applications denotes that the SPVs are beneficial to generate eco friendly electrical power generation [1]. In grid intefaced SPV unit, the maximum power is provided to the grid system by the SPV unit at MPP (Maximum Power Point) [2]. The traditional VSC (Voltage Source Converter) associated with smoothening inductor is the highly used synchronizing unit in gridinterfaced SPV system [3]. The single and two stage grid connected PV units are commonly used in three phase systems. The two-stage conversion system consists a DCDC converter stage with tracking of MPP and boosting up the voltage, and a DC-AC inverter stage for connecting the PV system to the grid system [4], [5]. A synchronized methodology of
In this, a single stage PV, Diesel generator and battery energy storage system is proposed. The DC-DC converter is operating under voltage control based on availability of sources. Based on the power generated by PV, the proposed control is classified into two modes 1) Power generation > Power Demand and 2) Power generation < Power Demand. During the time when PV is not generating power, the battery gets charged from other sources such as DG or grid.
II.
MODELLING OF PHOTOVOLTAIC CELL
The equivalent circuit of a PV cell is shown in Fig. 1
Fig 1 Solar Cell equivalent circuit In various literatures it is also termed as a five parameter model (Iph, Io, n, Rs and Rp). Where
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